Quadruplex telegraphy



(No Model.)

C. P. CARR. QUADRUPL-.EX TELBGRAPHY.

No.- 414,492. Patented NOV. 5, 1889.

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. with the false signal made by the armature of and arm ature of the neutral relay with the re- UNITED STATES PATENT EETCE.

OOURTLr-lND-I). GARR, OF CHICAGO, ASSIGNOR OF ONE-HALF TO FRED I.

MARSHALL, OF SOUTH EVANSTON, ILLINOIS.

TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 414,492, dated November 5, 1889.

Application filed February 25, 1888. Serial No. 265,235. (No model.)

Be it known that I, COURTLAND P. CARR, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Quadruplex Telegraphy, of which the following is a specification, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention consists in certain improvements in the third coils of the neutral relay, and in the location of the condenser and adjustable resistance in the main and artificial lines in the arms of the Wheatstone bridge between the neutral and polar relays, whereby I am enabled to so regulate the time of the discharge ot the condenser on a reversal at the distant station as to do away entirely the neutral relay, which enables me to operate the local circuit ofthe receiving-sounder directly by contacts on the front of the neutral relay-armature, as in the ordinary Morse sounder, and thus to dispense with the repeating-sounder and its circuit. I am also enabled to use but one condenser, which I find all-sufficient for the object in View, in place of two, as heretofore. These false signals are due to the change in polarity in the coils of the neutral relay on the reversal at the distant station, which produces a momentary deadness in the cores while one charge goes out and the other comes in.

In the accompanying drawings, which illustrate my means for preventing a false signal in the neutral relay on a reversal at the distant station, Figure lis a plan View of the circuit-connections withV the local circuits omitted, the artificial line being represented in dotted lines; and Fig. 2, a View of my present arrangement of the line and third coils ceiver-circuit operated thereby.

L, Fig. l, is the main line, A L showing the artificial line.

B is the'main-line battery; A, the neutral and D the polar relay.

E E F F are' the double coils of the neutral relay, differentially wound in the usual way.

R is the adjustable resistance, consisting, as

shown, of two equal and independently-adjustable parts lr o" on the main line L and artificial line A L, between the neutral and polar relays A and D, as described. The part r ot", the resistance It consists of a number of resistance-coils located in the main line L, between the polar and neutral relays, so as to regulate the time of the passage through the neutral relay of the current coming from the distant station. fr consists of a similar resistance located in the artificial line A L, also between the neutral and lpolar relays, by which the time of discharge of the condenser through the third coils on a reversal at the distant station can be regulated.

G G are the third coils, connected by the line L to the main line, between the resistance r and the polar relay, and to one plate of the condenser C.

A L represent the wire connecting the other plate of the condenser to the artificial line between the part 1" of the resistance and the polar relay. In this arrangement, in which the point of bridging is between the neutral and polar relays, the effects of a reversal at the distant station reach the bridge and discharge the condenser at exactly the same time that the effect enters the line-coils of the neutral relay, and by introducing a little resistance in the main line it allows the condenser to discharge an instant sooner than it affects the line-coils of the neutral relay, giving the time of discharge in the third coils a chance to be adjusted and preventing the false signal. It is thus seen that by adjusting the resistances r fr with respect to each other the times of the discharge through the condenser-circuit and of the passage ot' the current through the neutral relay may be regulated with respect to each other, so as to do away with the false signal.

A, Fig. 2, is the neutral relay having the armature a, with cross-pieces a a', and pivoted at ZJ.

G G are the third coils, and E E F F the differentially-Wonu d main-line coils.

R S is the receiving-sounder; L C, the local circuit; L B, the local battery, and so y the contact-points for operating the local circuit. It is thus seen thatl place an equal adjustable resistance in the main and artiicial IOG lines in the arms of a W'heatstone bridge made between the neutral and polar relays, and connect up the third coils of the neutral relay through a single condenser therewith. This arrangement of the third coils and condenser enables me to regulate the time of the discharge of the latter through the third coils, so as to be simultaneous with the passage of the current on the main line, and by employing an adjustable condenser to regulate the strength of the discharge and produce a synchronous eifect on the relay-armature I thus d0 away with the false signal and can operate the circuit of the receiving-sounder directly by contacts on the front of the relayarmature, in place of mediately through back contacts and a repeating-sounder, as heretofore. When the third coils are made adjustable to the armature of the neutral relay, the condenser may be non-adjustable, as the approach or withdrawal of the third coils answers the same purpose. I also wind the coils of the condenser-circuit on separate cores, and preferably place them above the mainline coils to act on the armature in the same direction. They, as well as the main-line coils, are made adjustable by any wellknown means; and I am thus enabled, further, to regulate the effect of the condenserdischarge on the armature by approaching or withdrawing the electro-m aguets to or from the armature. The position of the third coils vabove the line-coils, and nearer Ithe extremity of the armature, has the further advantage of affording an increased leverage on the latter.

All of the coils may be of the same size and should be very short, in order not to hold the discharge and cause the armature to work thick, the resistance of the third coils being from two hundred to three hundred ohms; and the armature is provided with two crosspieces, one for each set of coils, and has a retracting-spring, similar to that 0f a Morse relay, to pull it open when no current is passing in the coils.

In addition to the increased facility in the transmission and reception of messages derived from the foregoing novel organization of the different elements of the quadruple, I am 4enabled to effect a considerable saving in expense arising out of the simplicity of the arrangement, whereby I dispense with the repeater, its local circuit, and one condenser.

I do not limit myself to the use of a resistance located in the arms of a Wheatstone battery .between the neutral and polar relays when used with independent third coils in thecondenser-circuit alone; neither do I limit myself to the use of my invention in quadruplex telegraphy, as it is equally capable of application to multiplex telegraphy by making the proper adaptation.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In a quadruplex telegraph,the combination, with a main line, a neutral relay located.

therein, and its armature, o'f an electro-magnet adjustable to and from the armature of the neutral relay, a condenser, and condensercircuit in which the adjustable electro-magnet is included, substantially as described.

2. In a quadruplex telegraph, the combination, with the main line, the artificial line, and the battery, of the neutral and polar relays, connected as described, adjustable resistances r r', interposed between the neutral and polar relays on the main and artificial lines, respectively, between the point of bridging and the neutral relay, an electromagnet,a condenser and condenser-circuit between the main and artificial lines, in which the electro-magnet is included, and a neutral relay-armature common to both the relay and the electro-magnet, substantially as and for the purpose described.

3. In a neutral relay for quadruplex telegraphy, the combination, with the relay el'ectro-magnet, of the adjustable and independent electro-magnet located above and acting in the same direction as the relay-magnets, the armature having two cross-pieces, one for each set of coils, and means for reti-acting the armatures, substantially as hereinbefore set forth.

In testimony whereof I have hereunto set my hand and seal.

COURTLAND P. CARR. [L s] lVitnesses:

WM. M. STEELE, W. M. HOHMANN. 

